## Make output directory
outdir <- "~/multiOmic_benchmark/report/output/20191127_tcellTrajectory/"
ifelse(!dir.exists(outdir), dir.create(outdir), FALSE)
[1] FALSE

Based on the results of my benchmark, I set out to align expression and accessibility profiles from the F74 developing thymus dataset to detect changes in accessibility along pseudotime trajectories. While the benchmark was based on the task of label propagation, I here use the two most faithful methods (Seurat CCA and Conos) to achieve a common embedding of ATAC-seq and RNA-seq cells.

Load datasets.

rna.sce <- readRDS("~/my_data/F74_RNA_seurat_processed.RDS")
atac.sce <- readRDS("~/my_data/F74_ATAC_snapAtac_processed_bgmat.RDS")

## Re-normalize RNA data
seu.rna <- as.Seurat(rna.sce, counts = "counts")
seu.rna <- NormalizeData(seu.rna)
Performing log-normalization
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[----|----|----|----|----|----|----|----|----|----|
**************************************************|
logcounts(rna.sce) <- seu.rna@assays$RNA@data

Filter genes with zero variance

rna.gene.var <- as.matrix(counts(rna.sce)) %>% rowVars()
atac.gene.var <- as.matrix(counts(atac.sce)) %>% rowVars()

rna.sce <- rna.sce[which(rna.gene.var > 0),]
atac.sce <- atac.sce[which(atac.gene.var > 0),]

rna.sce; atac.sce
class: SingleCellExperiment 
dim: 24510 8321 
metadata(0):
assays(3): counts cpm logcounts
rownames(24510): RP11-34P13.3 RP11-34P13.7 ... AC233755.1 AC240274.1
rowData names(0):
colnames(8321): AAACCTGAGTTCGATC_1 AAACCTGCAAGTTGTC_1 ... TTTGTCAAGCTGAACG_2 TTTGTCAGTATTAGCC_2
colData names(1): annotation
reducedDimNames(0):
spikeNames(0):
class: SingleCellExperiment 
dim: 31122 5793 
metadata(0):
assays(3): counts cpm logcounts
rownames(31122): A1BG A1BG-AS1 ... ZYX ZZEF1
rowData names(0):
colnames(5793): AAACGAAAGTGAACCG-1 AAACGAACATCGGCCA-1 ... TTTGTGTTCGATCGCG-1 TTTGTGTTCTGAGTAC-1
colData names(28): orig.ident nCount_ATAC ... nFeature_ACTIVITY ident
reducedDimNames(2): LSI UMAP
spikeNames(0):

Integration of T cells clusters

I re-run the integration based on the T cell subset. To select cells from the scATAC dataset, I take the SnapATAC clusters that best correspond to T-cells, based on label transfer.

tcells.sce.atac <- atac.sce[,which(as.numeric(atac.sce$seurat_clusters) %in% c(1:9))]

tcells.rna.ix <- which(rna.sce$annotation %in% c("DN","DP (Q)", "DP (P)", "SP (1)", "SP (2)"))
tcells.sce.rna <- rna.sce[,tcells.rna.ix]

tcells.sce.list <- list(RNA=tcells.sce.rna, ATAC=tcells.sce.atac)

## Make color palette 4 cell types
cell.types <- as.character(unique(tcells.sce.rna$annotation))
cell.type.pal <- brewer.pal(length(cell.types), "Set1") %>% rev() %>% setNames(cell.types)

Next, I select genes on which to perform integration. I take the union of the most variable features in the RNA dataset and the most covered features in the ATAC dataset

hcg.atac <- select_highlyCovered(tcells.sce.list$ATAC, frac_cells = 0.2)
hvg.rna <- select_highlyVariable(tcells.sce.list$RNA)
Calculating gene means
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[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Calculating gene variance to mean ratios
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[----|----|----|----|----|----|----|----|----|----|
**************************************************|
seu.rna <- FindVariableFeatures(seu.rna, nfeatures = 2000,
                                # selection.method = "mvp", dispersion.cutoff=c(0.7, 100), mean.cutoff=c(0.02, 3)
                                )
Calculating gene variances
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[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Calculating feature variances of standardized and clipped values
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[----|----|----|----|----|----|----|----|----|----|
**************************************************|
hvg.rna <- VariableFeatures(seu.rna)

VariableFeaturePlot(seu.rna)

UpSetR::upset(UpSetR::fromList(list(HVG.RNA=hvg.rna, HCG.ATAC=hcg.atac)))

Remove cell cycle genes, that might interfere with pseudotime ordering

cell_cycle_genes <- read.table("~/annotations/cell_cycle_genes.tsv")$V1

integrate_features_union <- union(hvg.rna, hcg.atac)
integrate_features_union <- setdiff(integrate_features_union, cell_cycle_genes) 

## Select features in both datasets
integrate_features_union <- intersect(integrate_features_union, intersect(rownames(tcells.sce.list$ATAC), rownames(tcells.sce.list$RNA))) 

Visualize T cells in RNA dataset

tcells.seu.list <- map(tcells.sce.list, ~ as.Seurat(.x))
All keys should be one or more alphanumeric characters followed by an underscore '_', setting key to LSI_All keys should be one or more alphanumeric characters followed by an underscore '_', setting key to UMAP_
tcells.RNA.union <- tcells.seu.list$RNA
VariableFeatures(tcells.RNA.union) <- integrate_features_union
tcells.RNA.union <- ScaleData(tcells.RNA.union) %>% RunPCA() %>% RunUMAP(dims=1:40)
Centering and scaling data matrix

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The following 176 features requested have zero variance (running reduction without them): TM4SF18, MEOX2, ASGR2, DMRT2, KIR2DL4, CACNA1B, FREM2, MYZAP, TOX3, PRIMA1, PPP2R2B, PTPRZ1, CMTM5, TREM2, CALB2, TMTC1, CDH6, PKHD1L1, ISLR2, KRT7, MYH8, DCX, CCSER1, MSLN, CDH19, EYA4, P2RY12, PLA2G2D, ADAMTS16, KCNJ5, PAPPA, QRFPR, ADGRG2, NFIA-AS2, LUZP2, NALCN, FABP7, TSPEAR-AS1, GPR1, CD300LF, A4GALT, AP000439.1, CEACAM3, SLITRK2, KIR3DL1, AC147651.1, MUC15, FFAR4, C11orf53, KLK11, WIF1, CFHR1, TMEM233, FOLR3, GRID2, GALNT15, FAM19A1, TAC1, PTCHD4, CCL11, ZNF385B, GABRA1, ADH1B, LINC01048, LMOD1, TNNT1, ACTL6B, SEMA3E, HOXD-AS2, NTF4, SLC35F1, MANEAL, FEV, RAB3C, SYT9, HMCN2, ZFHX4-AS1, PCSK9, MMP12, ABCB11, AC002066.1, ADAM23, ADCY5, ADGB, ADGRB1, ANKRD29, ATP2B2, C4orf45, CCDC33, CDH18, CDK15, CERS1, CFAP161, CLRN1-AS1, CNBD1, CNGB3, CNTN5, COL8A2, CTNND2, DCC, DSCAM, EPHA6, FGF12, FSTL5, GABBR2, GABRB1, GABRG3, GALNT13, GHR, GLIS3, GNG12-AS1, GNGT1, GRIN2B, GRM1, GRM8, HMCN1, HPSE2, HS3ST5, HS6ST3, IL1RAPL2, ITGBL1, KCNB1, KCNH7, LINC00639, LINC01169, LINC01170, LINC01182, LINC01317, LINC01505, LINGO1, LINGO2, LRRC4C, LRRTM4, LY75-CD302, MAP6, MLIP, MYRIP, NEBL, NKAIN2, NKAIN3, NRG1, OPCML, PCDH15, PCDHGA4, PDZRN4, PIK3C2G, PKNOX2, PNPLA1, POU6F2, PPFIA2, PRR5-ARHGAP8, PTPN5, PTPRT, RALYL, RERG, RGS7, RIMS1, RIN2, RYR3, SHANK2, SNTG1, SORCS3, STON1-GTF2A1L, SYN2, TENM2, THSD4, TRPC6, TSPEAR, TVP23C-CDRT4, UNC80, USH1C, VAX2, VWA3B, XKR4, ZBTB7C, ZNF804BPC_ 1 
Positive:  SATB1, PTPRC, MTSS1, APBB1IP, LYST, SH2D1A, CAMK4, LBH, FBLN5, LEF1 
       PLEKHG1, VOPP1, CD247, MXD1, TCF12, ARHGEF7, ALDH1A2, NFATC3, TBC1D19, SYTL3 
       ADAMTS17, ANO6, DAPK1, CALN1, THEMIS, PITPNM2, NLGN4X, MAPRE2, GALNT7, ZNF280D 
Negative:  ENO1, GSTP1, FABP5, TMSB10, SMS, PKM, NME4, VIM, RPL37A, YWHAQ 
       NCL, IGFBP2, CAPG, NDUFA12, TRDC, PGK1, PARVB, LDHB, ATOX1, SELL 
       CDC123, NUDC, IGLL1, UBE2N, FXYD2, GMPS, C20orf27, SLC25A39, ANXA1, C12orf75 
PC_ 2 
Positive:  RPL37A, EIF3H, LDHB, TBCA, IL32, SERGEF, SMPD3, ITGAE, AATF, FBLN5 
       NDUFA12, SOD1, DNAJC15, C12orf75, MRPL33, TMSB10, HNRNPC, CCDC57, SMCO4, GDI2 
       OLA1, ALDH1A2, COX7A2L, CST3, CYSTM1, ATOX1, GYPC, PDCD6, FABP5, RALY 
Negative:  MBNL1, ITPR2, PTPRC, MTRNR2L12, ADAM10, MSI2, CDK6, SELL, JCHAIN, RNF213 
       MME, TCF12, BPTF, BCL11B, NIPBL, MACF1, PIK3R1, HIVEP3, SOCS2, GALNT7 
       IKZF2, RUNX1, SPTBN1, PRRC2B, BCL2, DIAPH1, MYCBP2, SLC38A1, MBP, RUFY3 
PC_ 3 
Positive:  HLA-B, TOX2, COTL1, CTSW, KLRB1, CD40LG, SIRPG, GZMM, CLDN1, CD74 
       ITM2A, GBP2, BACH2, HPGD, PDE4D, TNFRSF1B, S100A10, CLEC2D, XCL1, GFOD1 
       CRTAM, MATK, DENND2D, PDCD1, GIMAP4, STAT1, ZNF683, CD226, HLA-A, TNFRSF25 
Negative:  TFDP2, JCHAIN, ATP6AP1L, DEFA6, MME, GALNT2, PCGF5, ADGRG1, GLIPR1, MSI2 
       NINL, CEP70, CDK6, PTPN2, FXYD2, TRDC, GSTP1, SELL, SOCS2, RGPD3 
       SMPD3, FABP5, LYST, SSBP2, PITPNM2, DLEU7, UBE2E1, NUCB2, PPP1R1C, BCL11A 
PC_ 4 
Positive:  SMPD3, C12orf75, TUBA1C, LCP1, HIST1H2AB, SMS, SMCO4, GMPS, FABP5, XPO1 
       IGFBP2, CCND3, TAF15, RGS3, SREBF2, YWHAQ, TMSB15A, ABCD3, NCL, PHIP 
       GNAS, EPB41L2, SYNE2, STAG2, CNTLN, VIM, NUP210, MCTP1, NUDC, NFATC3 
Negative:  JCHAIN, SELL, DEFA6, SOCS2, GLIPR1, ATP6AP1L, MME, RGPD3, XG, DPP4 
       IFI6, ENAM, GNAL, EVL, NEGR1, FRMPD2, EVA1A, PIK3CD, GALNT2, NDST3 
       MBP, RNF144A, FXYD2, COL1A2, SMIM24, NDFIP2, OXNAD1, ACTN1, LSP1, LINC00861 
PC_ 5 
Positive:  HPGD, BACH2, TOX2, ITM2A, GZMM, ST6GAL1, ARAP2, CD96, TGFBR2, LZTFL1 
       VIM, EVL, CD44, SATB1, IL2, TUSC3, CYTIP, PDE4D, MAD1L1, SLC2A3 
       ARHGAP31, GPR183, PGK1, ANKRD44, STK4, BCL2, GNG2, IKZF1, ICOS, ETS1 
Negative:  XCL1, TNFRSF9, CTSW, XCL2, GBP2, TNFRSF1B, S100A4, GNG4, NPW, CD74 
       HOPX, IGFBP4, CD151, SH3BGRL2, NFATC1, LYST, ATP9A, NR4A2, LINC01480, CLEC2D 
       MIR3142HG, LINC01281, PREX1, HDAC9, PHACTR1, MAP7, CST3, CXCR3, PITPNM2, PDCD1 
The default method for RunUMAP has changed from calling Python UMAP via reticulate to the R-native UWOT using the cosine metric
To use Python UMAP via reticulate, set umap.method to 'umap-learn' and metric to 'correlation'
This message will be shown once per session09:11:47 UMAP embedding parameters a = 0.9922 b = 1.112
09:11:47 Read 7101 rows and found 40 numeric columns
09:11:47 Using Annoy for neighbor search, n_neighbors = 30
09:11:47 Building Annoy index with metric = cosine, n_trees = 50
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
09:11:48 Writing NN index file to temp file /tmp/RtmpIaaTXb/file9c876abf67
09:11:48 Searching Annoy index using 1 thread, search_k = 3000
09:11:51 Annoy recall = 100%
09:11:52 Commencing smooth kNN distance calibration using 1 thread
09:11:55 Initializing from normalized Laplacian + noise
09:11:55 Commencing optimization for 500 epochs, with 314138 positive edges
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
09:12:14 Optimization finished
DimPlot(tcells.RNA.union, group.by = "annotation", label=TRUE) + ggtitle("RNA - feature union")
Using `as.character()` on a quosure is deprecated as of rlang 0.3.0.
Please use `as_label()` or `as_name()` instead.
This warning is displayed once per session.

Visualize markers

t.cell.markers <- list(known.markers = c("CD34", "IGLL1", "TRGC2", "TRDC", "PTCRA", "TRBC2", "TRAC", "CD4", "CD8A", "CD8B"),
                       chemokine.receptors = c("CCR9", "CCR7"),
                       tcr.activation = c("CD5", "CD27"),
                       proliferation=c("PCNA", "CDK1", "MKI67"),
                       cyclin.D = c("CCND2", "CCND3"),
                       recombination=c("RAG1", "RAG2"),
                       apoptosis=c("HRK","BMF", "TP53INP1"),
                       stage.markers = c("ST18", "HIVEP3", "RGPD3", "SMPD3", "AQP3", "RORC", "SATB1", "TOX2")
                       ) 
# FeaturePlot(tcells.RNA.ref, features = t.cell.markers$known.markers, cols = viridis::viridis(n=10))
FeaturePlot(tcells.RNA.union, features = t.cell.markers$known.markers, cols = viridis::viridis(n=10))

Visualize T cells in ATAC dataset

Colored by clusters called with SnapATAC

tcells.ATAC.union <- tcells.seu.list$ATAC
# tcells.ATAC.union <- NormalizeData(tcells.ATAC.union)
VariableFeatures(tcells.ATAC.union) <- integrate_features_union
tcells.ATAC.union <- RunLSI(tcells.ATAC.union, n=50, scale.max = NULL)
RunLSI is being moved to Signac. Equivalent functionality can be achieved via the Signac::RunTFIDF and Signac::RunSVD functions; for more information on Signac, please see https://github.com/timoast/SignacRunLSI is being moved to Signac. Equivalent functionality can be achieved via the Signac::RunTFIDF and Signac::RunSVD functions; for more information on Signac, please see https://github.com/timoast/SignacRunLSI is being moved to Signac. Equivalent functionality can be achieved via the Signac::RunTFIDF and Signac::RunSVD functions; for more information on Signac, please see https://github.com/timoast/SignacPerforming TF-IDF normalization
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Running SVD on TF-IDF matrix
Scaling cell embeddings
Cannot add objects with duplicate keys (offending key: LSI_), setting key to 'lsi_'
tcells.ATAC.union <- RunUMAP(tcells.ATAC.union, reduction = "lsi", dims = 1:50)
10:10:05 UMAP embedding parameters a = 0.9922 b = 1.112
10:10:05 Read 4977 rows and found 50 numeric columns
10:10:05 Using Annoy for neighbor search, n_neighbors = 30
10:10:05 Building Annoy index with metric = cosine, n_trees = 50
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
10:10:06 Writing NN index file to temp file /tmp/RtmpIaaTXb/file9c861ce1d48
10:10:06 Searching Annoy index using 1 thread, search_k = 3000
10:10:08 Annoy recall = 100%
10:10:11 Commencing smooth kNN distance calibration using 1 thread
10:10:14 Initializing from normalized Laplacian + noise
10:10:14 Commencing optimization for 500 epochs, with 172060 positive edges
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
10:10:26 Optimization finished
Cannot add objects with duplicate keys (offending key: UMAP_), setting key to 'umap_'
DimPlot(tcells.ATAC.union, reduction = "umap", group.by = "seurat_clusters", label = TRUE) + ggtitle("ATAC gmat")

Run CCA

Makes imputed transcriptome profile for the ATAC-seq cells to allow co-embedding

sce.list <- tcells.sce.list
reference = "RNA"
query = "ATAC" 
seurat.list <- imap(sce.list, ~ as.Seurat(.x, assay=.y))
seurat.list <- imap(seurat.list, ~ RenameCells(.x, add.cell.id=.y))
## Scale data
seurat.list <- map(seurat.list, ~ ScaleData(.x))
## Calculate CCA anchors
transfer.anchors <- FindTransferAnchors(reference = seurat.list[[reference]], 
                                        query = seurat.list[[query]],
                                        features = integrate_features_union, 
                                        reduction = "cca")

## Impute expression profiles for ATAC cells (for all genes, not just integration features)
refdata <- GetAssayData(seurat.list$RNA, assay = "RNA", slot = "data")
imputation <- TransferData(anchorset = transfer.anchors, refdata = refdata, weight.reduction = seurat.list$ATAC[["LSI"]])

## Merge datasets and co-embed
seurat.list$ATAC[["RNA"]] <- imputation
coembed <- merge(x = seurat.list$RNA, y = seurat.list$ATAC)

coembed <- ScaleData(coembed, features = integrate_features_union, do.scale = FALSE)
coembed <- RunPCA(coembed, features = integrate_features_union, verbose = FALSE)
coembed <- RunUMAP(coembed, dims = 1:30)

coembed <- AddMetaData(coembed, metadata = ifelse(colnames(coembed) %in% colnames(seurat.list[[reference]]), reference, query), col.name = "tech")

Transfer labels on ATAC dataset

celltype.predictions <- TransferData(anchorset = transfer.anchors, 
                                     refdata = seurat.list[[reference]]$annotation, 
                                     weight.reduction = seurat.list$ATAC[["LSI"]])

coembed <- AddMetaData(coembed, metadata = celltype.predictions)
coembed@meta.data %<>%
  rownames_to_column() %>%
  dplyr::mutate(annotation=ifelse(is.na(predicted.id) , annotation, NA)) %>%
  column_to_rownames()

coembed@meta.data <-
  coembed@meta.data %>%
  rownames_to_column() %>%
  dplyr::mutate(annotation=ifelse(is.na(annotation) & prediction.score.max > 0.5, predicted.id, annotation)) %>%
  dplyr::mutate(annotation=ifelse(annotation=="SP (2)", NA, annotation)) %>%
  column_to_rownames()
CombinePlots(
  list(DimPlot(coembed, group.by = c("predicted.id"), cols = cell.type.pal) + ggtitle("prediction"),
  DimPlot(coembed, group.by = c("annotation"), cols = cell.type.pal) + ggtitle("Original + prediction")),
  legend = "top"
  )

FeaturePlot(coembed, features = "prediction.score.max", cells = which(coembed$tech=="ATAC")) + scale_color_viridis_c()
Scale for 'colour' is already present. Adding another scale for 'colour', which will replace the existing scale.

Run Pseudotime analysis

Identify cell of origin among the DN cells based on expression of IGLL1 and CD34

FeaturePlot(coembed, features = c("IGLL1", "CD34"), split.by = "tech", slot = "data", cols = viridis::viridis(n=100))

cell.oo <-
  coembed@meta.data %>% 
  rownames_to_column("cell") %>%
  mutate(IGLL1=coembed@assays$RNA@counts["IGLL1",cell]) %>%
  select(cell, annotation, IGLL1) %>%
  arrange(-IGLL1) %>%
  filter(annotation=="DN") %>%
  top_n(1, IGLL1) %>%
  pull(cell)

coembed@reductions$umap@cell.embeddings %>%
  as.tibble(rownames="cell") %>%
  mutate(cell.oo = ifelse(cell %in% cell.oo, T, F)) %>%
  ggplot(aes(UMAP_1, UMAP_2)) +
  geom_point(color="grey50") +
  geom_point(data=. %>% filter(cell.oo),color='red') +
  ggrepel::geom_text_repel(data=. %>% filter(cell.oo), aes(label="cell of origin"), color='red') +
  theme_cowplot() 

coembed <- AddMetaData(coembed, ifelse(colnames(coembed)==cell.oo, TRUE, FALSE), col.name = "iroot_cell")
merged.sce <- SingleCellExperiment(list(counts=coembed@assays$RNA@counts, logcounts=coembed@assays$RNA@data), colData=coembed@meta.data[, c("annotation", "tech", "iroot_cell")],
                     reducedDims = map(coembed@reductions, ~ .x@cell.embeddings))

saveRDS(object = merged.sce, "~/my_data/Tcells_CCA_integration_20191203.RDS")
saveRDS(object = integrate_features_union, "~/my_data/intFeatures_Tcells_CCA_integration_20191203.RDS")

I infer pseudotime using the diffusion pseudotime algorithm as implemented in scanpy. Making an R/reticulate wrapper for this function would be nice, but for now, see multiOmic_benchmark/DPT_tcells.ipynb.

Read scanpy output and save in R object.

dpt <- read.csv('~/my_data/Tcells_CCA_integration_20191127_scanpy_dpt.csv') %>%
  select(X, dpt_pseudotime)

coembed <- AddMetaData(coembed, column_to_rownames(dpt, 'X'))
saveRDS(coembed, "~/my_data/Tcells_CCA_integration_seurat_20191203.Rmd")
coembed <- readRDS("~/my_data/Tcells_CCA_integration_seurat_20191203.Rmd")

Visualize pseudotime

FeaturePlot(coembed, reduction = "umap", feature = "dpt_pseudotime", split.by = "tech", col=viridis::viridis(10)) 

Save figure

coembed.umaps.pl <- plot_grid(
  DimPlot(coembed, group.by = c("tech")) + theme(legend.position = "top"),
  DimPlot(coembed, group.by = c("annotation"), cols = cell.type.pal, label = TRUE, label.size = 5) + theme(legend.position = "none"),
  FeaturePlot(coembed, reduction = "umap", feature = "dpt_pseudotime") + scale_color_viridis_c(name="Diffusion\npseudotime") + ggtitle(""),
  nrow=1, ncol=3, rel_widths = c(1,1,1.2),
  labels = c("A", "B", "C")
) 
Scale for 'colour' is already present. Adding another scale for 'colour', which will replace the existing scale.
coembed.umaps.pl +
  ggsave(paste0(outdir, "coembed_umaps.png"), width=12, height = 4)

coembed@meta.data %>%
  dplyr::mutate(`DPT rank`=dense_rank(dpt_pseudotime)) %>%
  ggplot(aes(`DPT rank`)) +
  geom_histogram(aes(fill=annotation), bins=50) +
  facet_grid(annotation~tech, scales="free_y") +
  theme_bw(base_size = 16) +
  scale_fill_manual(values = cell.type.pal)

Check expression of markers along pseudotime

coembed@assays$RNA@data[t.cell.markers$known.markers, ] %>%
  as.matrix() %>%
  reshape2::melt(varnames=c("gene", "cell")) %>%
  left_join(coembed@meta.data[,"dpt_pseudotime", drop=F] %>% rownames_to_column("cell")) %>%
  mutate(pseudotime.rank=dense_rank(dpt_pseudotime)) %>%
  group_by(gene) %>%
  arrange(pseudotime.rank) %>%
  # mutate(value=(value-min(value))/max(value)-min(value)) %>%
  mutate(value=zoo::rollmean(value, k=5, fill=NA)) %>% 
  # mutate(value=(value-mean(value))/sd(value)) %>%
  ungroup() %>%
  mutate(gene=factor(gene, levels=rev(unique(gene)))) %>%
  ggplot(aes(pseudotime.rank, gene, fill=value)) +
  geom_tile() +
  scale_fill_viridis_c(name="log expression") +
  theme_bw(base_size = 16) +
  theme(panel.border = element_blank(), panel.grid = element_blank())

Bin pseudotime and visualize cell type composition

dpt.df <- 
  coembed@meta.data %>%
  rownames_to_column("cell") %>%
  dplyr::mutate(dpt_rank=dense_rank(dpt_pseudotime)) %>%
  mutate(dpt_bin=cut(dpt_rank, breaks = 100)) %>%
  mutate(dpt_bin=as.numeric(dpt_bin)) %>%
  select(cell,tech, annotation, prediction.score.max, dpt_bin, dpt_pseudotime, dpt_rank)

cell.type.pl <- dpt.df %>%
  ggplot(aes(dpt_bin, fill = annotation)) +
  # geom_histogram(bins=100) +
  geom_bar() +
  scale_fill_manual(values=cell.type.pal, na.value="grey50") +
  facet_grid(tech~., scales="free_y") +
  xlab("Pseudotime bin") +
  theme_bw(base_size = 16)

cell.type.pl

Correlation between global accessibility and pseudotime ordering.

snap.out <- readRDS(file = "~/my_data/cellranger-atac110_count_30439_WSSS8038360_GRCh38-1_1_0.snapATAC.RDS")

groups <- dpt.df[dpt.df$tech=="ATAC", c("cell", "dpt_bin")]
bmat <- snap.out@bmat[str_remove(groups$cell, "ATAC_"),]
frac.accessible <- rowSums(bmat)/ncol(bmat)
acc.fraction.pl <- groups %>%
  mutate(frac_accessible=frac.accessible[str_remove(cell, "ATAC_")]) %>%
  ggplot(aes(dpt_bin, frac_accessible)) +
  geom_boxplot(aes(group=as.factor(dpt_bin)), outlier.alpha = 0.3, outlier.size = 0.7) +
  # geom_jitter(alpha=0.1) +
  xlab("Pseudotime bin") +
  ylab("Fraction of accessible bins") +
  facet_grid('ATAC'~.) +
  theme_bw(base_size = 16) 
  
dpt.pl <- plot_grid(cell.type.pl + theme(legend.position="top", axis.text.x = element_blank(), axis.ticks.x = element_blank(), axis.title.x = element_blank()), 
          acc.fraction.pl, 
          align = "v", ncol=1, nrow=2, axis="l")

dpt.pl +
  ggsave(paste0(outdir, "DPT_bins.png"), width=10, height = 7)

Motif analysis

I initially wanted to call peaks from SnapATAC clusters, then build a cell x peak matrix on those detected peaks, but SnapATAC/MACS2 don’t seem to work.

Alternative: load peak matrix from cellranger and add to snap object

filt.peaks <- Read10X_h5("~/my_data/filtered_peak_bc_matrix.h5")
peaks.mat <- str_split(rownames(filt.peaks), pattern = ":|-") %>% map(rbind) %>% purrr::reduce(rbind)
peaks.gr <- GRanges(peaks.mat[,1], IRanges(as.numeric(peaks.mat[,2]), as.numeric(peaks.mat[,3])))
snap.pmat <- createSnapFromPmat(mat=t(filt.peaks[,snap.out@barcode]), barcodes=snap.out@barcode, peaks=peaks.gr)
snap.pmat

Calculating deviations in TF accessibility using ChromVAR. This is a measure of how much is motif accessibility in each cell is enriched compared to all the cells and general cell coverage. While SnapATAC has an wrapper around ChromVAR that outputs the deviation matrix, I just take the code from that function and run every step separately to keep the useful outputs and statistics of chromVAR.

snap.pmat = makeBinary(snap.pmat, "pmat")

obj = snap.pmat
input.mat="pmat"
min.count=10
species="Homo sapiens"
genome=BSgenome.Hsapiens.UCSC.hg38

data.use = obj@pmat
peak.use = obj@peak

ncell = nrow(data.use)

idy = which(Matrix::colSums(data.use) >= min.count)
data.use = data.use[,idy,dropping=TRUE]
    
peak.use = peak.use[idy]

rse <- SummarizedExperiment(
        assays = list(counts = t(data.use)), 
                 rowRanges = peak.use, 
                 colData = DataFrame(Cell_Type=1:nrow(data.use), depth=Matrix::rowSums(data.use))
    );
rse <- addGCBias(rse, genome = genome);
motifs <- getJasparMotifs(collection = "CORE", species=species)
motif_mm <- matchMotifs(motifs, rse, genome = genome);
dev <- computeDeviations(object = rse, annotations = motif_mm);
var <- computeVariability(dev)

Save

rowData(dev) %<>%
  as.tibble(rownames="motif") %>%
  full_join(var) %>%
  column_to_rownames('motif') %>%
  DataFrame()

saveRDS(dev, "~/my_data/Tcells_peaks/Tcells_chromVarOutput.RDS")  

Visualize deviation scores of the most variable motifs, ordered in pseudotime.

png(paste0(outdir, "chromVAR_motif_heatmap.png"), width=1000, height = 900)
smooth.mmat %>%
  # mmat.topvar[,sample_dpt_bins.df$cell] %>%
  pheatmap::pheatmap(show_colnames = F, cluster_cols = F, clustering_distance_rows = "correlation",
                     annotation_col = sample_dpt_bins.df[,c("cell", "annotation", "dpt_pseudotime")] %>% column_to_rownames("cell"), 
                     annotation_colors = list(annotation=cell.type.pal, dpt_pseudotime=viridis::viridis(100)), fontsize = 18, fontsize_row = 12,
                     # color = colorRampPalette(rev(brewer.pal(n = 7, name ="Spectral")))(100))
                     breaks=seq(-3,3, length.out = 100)
  )
dev.off()
null device 
          1 
dpt.order <-
  dpt.df %>%
  filter(tech=="RNA") %>%
  arrange(dpt_pseudotime) 

coembed <- ScaleData(coembed, do.scale=TRUE)
Centering and scaling data matrix

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gexmat.topvar <- coembed@assays$RNA@scale.data[tf.topvar[which(tf.topvar %in% rownames(coembed@assays$RNA@scale.data))],dpt.order$cell]
smooth.gexmat <- apply(gexmat.topvar, 1, function(x) zoo::rollmean(x, k=30)) %>% t() 
smooth.gexmat %>%
  # t() %>% scale() %>% t() %>%
  pheatmap::pheatmap(show_colnames = F, cluster_rows = T, cluster_cols = F, 
                     annotation_col = dpt.order[,c("cell", "annotation", "dpt_pseudotime")] %>% column_to_rownames("cell"),
                     annotation_colors = list(annotation=cell.type.pal, dpt_pseudotime=viridis::viridis(100)), fontsize = 18, fontsize_row = 12,
                     breaks=seq(-2,2, length.out = 100)
  )

Compare motif accessibility trend with gene expression trend along pseudotime. I find both examples of correlation between accessibility and TF expression (e.g. RUNX2, ELK3) and anti-correlation (e.g. JUN, ETV6).

map(list("JUN", "ELK3", "RUNX2", "REL", "FOS", "ETV6", "TCF3"), ~ plot.tfs(.x) + ggsave(paste0(outdir, paste0('TF_plot_',.x,".png")), width = 8, height=5))
Unequal factor levels: coercing to characterbinding character and factor vector, coercing into character vectorbinding character and factor vector, coercing into character vectorbinding factor and character vector, coercing into character vectorbinding character and factor vector, coercing into character vector
[[1]]

[[2]]

[[3]]

[[4]]

[[5]]

[[6]]

[[7]]

Ways to optimize this analysis

  • Improved motif database (more motifs, Jaspar2020 or HOCOMOCO)
  • Calling peaks on clusters ()

–>

–> –> –> –> –> –> –> –>

–> –> –> –> –> –> –>

–> –> –> –> –>

–> –> –> –>

–> –> –>



---
title: "Pseudotime analysis of T-cells in developing thymus"
output: html_notebook
---

```{r}
library(Seurat)
library(conos)
library(ggpubr)
library(tidyverse)
library(SingleCellExperiment)
library(chromVAR)
library(motifmatchr)
library(BSgenome.Hsapiens.UCSC.hg38)
# library(monocle3)
source("~/multiOmic_benchmark/utils.R")
source("~/multiOmic_benchmark/integrateBenchmark.R")
source("~/multiOmic_benchmark/preprocess/selectFeatures.R")

## Make output directory
outdir <- "~/multiOmic_benchmark/report/output/20191127_tcellTrajectory/"
ifelse(!dir.exists(outdir), dir.create(outdir), FALSE)
```
 
 
Based on the results of my benchmark, I set out to align expression and accessibility profiles from the F74 developing thymus dataset to detect changes in accessibility along pseudotime trajectories. While the benchmark was based on the task of label propagation, I here use the two most faithful methods (Seurat CCA and Conos) to achieve a common embedding of ATAC-seq and RNA-seq cells.

Load datasets.

```{r}
rna.sce <- readRDS("~/my_data/F74_RNA_seurat_processed.RDS")
atac.sce <- readRDS("~/my_data/F74_ATAC_snapAtac_processed_bgmat.RDS")

## Re-normalize RNA data
seu.rna <- as.Seurat(rna.sce, counts = "counts")
seu.rna <- NormalizeData(seu.rna)
logcounts(rna.sce) <- seu.rna@assays$RNA@data

```

Filter genes with zero variance
```{r}
rna.gene.var <- as.matrix(counts(rna.sce)) %>% rowVars()
atac.gene.var <- as.matrix(counts(atac.sce)) %>% rowVars()

rna.sce <- rna.sce[which(rna.gene.var > 0),]
atac.sce <- atac.sce[which(atac.gene.var > 0),]

rna.sce; atac.sce
```


## Integration of T cells clusters
I re-run the integration based on the T cell subset. To select cells from the scATAC dataset, I take the SnapATAC clusters that best correspond to T-cells, based on label transfer.

```{r}
tcells.sce.atac <- atac.sce[,which(as.numeric(atac.sce$seurat_clusters) %in% c(1:9))]

tcells.rna.ix <- which(rna.sce$annotation %in% c("DN","DP (Q)", "DP (P)", "SP (1)", "SP (2)"))
tcells.sce.rna <- rna.sce[,tcells.rna.ix]

tcells.sce.list <- list(RNA=tcells.sce.rna, ATAC=tcells.sce.atac)

## Make color palette 4 cell types
cell.types <- as.character(unique(tcells.sce.rna$annotation))
cell.type.pal <- brewer.pal(length(cell.types), "Set1") %>% rev() %>% setNames(cell.types)
```

Next, I select genes on which to perform integration. I take the union of the most variable features in the RNA dataset and the most covered features in the ATAC dataset

```{r}
hcg.atac <- select_highlyCovered(tcells.sce.list$ATAC, frac_cells = 0.2)
hvg.rna <- select_highlyVariable(tcells.sce.list$RNA)

seu.rna <- FindVariableFeatures(seu.rna, nfeatures = 2000,
                                # selection.method = "mvp", dispersion.cutoff=c(0.7, 100), mean.cutoff=c(0.02, 3)
                                )
hvg.rna <- VariableFeatures(seu.rna)

VariableFeaturePlot(seu.rna)
UpSetR::upset(UpSetR::fromList(list(HVG.RNA=hvg.rna, HCG.ATAC=hcg.atac)))
```

Remove cell cycle genes, that might interfere with pseudotime ordering
```{r}
cell_cycle_genes <- read.table("~/annotations/cell_cycle_genes.tsv")$V1

integrate_features_union <- union(hvg.rna, hcg.atac)
integrate_features_union <- setdiff(integrate_features_union, cell_cycle_genes) 

## Select features in both datasets
integrate_features_union <- intersect(integrate_features_union, intersect(rownames(tcells.sce.list$ATAC), rownames(tcells.sce.list$RNA))) 

```

#### Visualize T cells in RNA dataset
```{r}
tcells.seu.list <- map(tcells.sce.list, ~ as.Seurat(.x))
tcells.RNA.union <- tcells.seu.list$RNA
VariableFeatures(tcells.RNA.union) <- integrate_features_union
tcells.RNA.union <- ScaleData(tcells.RNA.union) %>% RunPCA() %>% RunUMAP(dims=1:40)

DimPlot(tcells.RNA.union, group.by = "annotation", label=TRUE) + ggtitle("RNA - feature union")
```

Visualize markers 
```{r, fig.width=15, fig.height=10}
t.cell.markers <- list(known.markers = c("CD34", "IGLL1", "TRGC2", "TRDC", "PTCRA", "TRBC2", "TRAC", "CD4", "CD8A", "CD8B"),
                       chemokine.receptors = c("CCR9", "CCR7"),
                       tcr.activation = c("CD5", "CD27"),
                       proliferation=c("PCNA", "CDK1", "MKI67"),
                       cyclin.D = c("CCND2", "CCND3"),
                       recombination=c("RAG1", "RAG2"),
                       apoptosis=c("HRK","BMF", "TP53INP1"),
                       stage.markers = c("ST18", "HIVEP3", "RGPD3", "SMPD3", "AQP3", "RORC", "SATB1", "TOX2")
                       ) 
# FeaturePlot(tcells.RNA.ref, features = t.cell.markers$known.markers, cols = viridis::viridis(n=10))
FeaturePlot(tcells.RNA.union, features = t.cell.markers$known.markers, cols = viridis::viridis(n=10))
```

#### Visualize T cells in ATAC dataset

Colored by clusters called with SnapATAC

```{r}
tcells.ATAC.union <- tcells.seu.list$ATAC
# tcells.ATAC.union <- NormalizeData(tcells.ATAC.union)
VariableFeatures(tcells.ATAC.union) <- integrate_features_union
tcells.ATAC.union <- RunLSI(tcells.ATAC.union, n=50, scale.max = NULL)
tcells.ATAC.union <- RunUMAP(tcells.ATAC.union, reduction = "lsi", dims = 1:50)

DimPlot(tcells.ATAC.union, reduction = "umap", group.by = "seurat_clusters", label = TRUE) + ggtitle("ATAC gmat")
```

#### Run CCA 

Makes imputed transcriptome profile for the ATAC-seq cells to allow co-embedding

```{r, fig.width=12, fig.height=5, eval=FALSE}
sce.list <- tcells.sce.list
reference = "RNA"
query = "ATAC" 
seurat.list <- imap(sce.list, ~ as.Seurat(.x, assay=.y))
seurat.list <- imap(seurat.list, ~ RenameCells(.x, add.cell.id=.y))
## Scale data
seurat.list <- map(seurat.list, ~ ScaleData(.x))
## Calculate CCA anchors
transfer.anchors <- FindTransferAnchors(reference = seurat.list[[reference]], 
                                        query = seurat.list[[query]],
                                        features = integrate_features_union, 
                                        reduction = "cca")

## Impute expression profiles for ATAC cells (for all genes, not just integration features)
refdata <- GetAssayData(seurat.list$RNA, assay = "RNA", slot = "data")
imputation <- TransferData(anchorset = transfer.anchors, refdata = refdata, weight.reduction = seurat.list$ATAC[["LSI"]])

## Merge datasets and co-embed
seurat.list$ATAC[["RNA"]] <- imputation
coembed <- merge(x = seurat.list$RNA, y = seurat.list$ATAC)

coembed <- ScaleData(coembed, features = integrate_features_union, do.scale = FALSE)
coembed <- RunPCA(coembed, features = integrate_features_union, verbose = FALSE)
coembed <- RunUMAP(coembed, dims = 1:30)

coembed <- AddMetaData(coembed, metadata = ifelse(colnames(coembed) %in% colnames(seurat.list[[reference]]), reference, query), col.name = "tech")
```


```{r, echo=FALSE}
## Load output for quick knitting
coembed <- readRDS("~/my_data/Tcells_CCA_integration_seurat_20191203.Rmd")
```

<!-- Run Conos -->
<!-- ```{r} -->
<!-- data.processed <- map(sce.list, ~ as.Seurat(.x))  -->
<!-- VariableFeatures(data.processed[[reference]]) <- integrate_features_union -->
<!-- VariableFeatures(data.processed[[query]]) <- integrate_features_union -->
<!-- data.processed <- map(data.processed, ~ ScaleData(.x) %>% RunPCA(dims=1:30)) -->
<!-- l.con <- Conos$new(data.processed,n.cores=30) -->
<!-- l.con$buildGraph(k=15,k.self=5,k.self.weigh=0.01,ncomps=30,n.odgenes=5e3,space='PCA')  -->

<!-- l.con$findCommunities(resolution=1.5) -->
<!-- l.con$embedGraph(alpha=1/2) -->

<!-- conos.out <- conos.model$model -->
<!-- l.con$plotGraph(color.by = "sample") -->

<!-- geneX <- seurat.list[[reference]]@assays$RNA@scale.data[3,] -->
<!-- geneX <- setNames(annotation[,1], rownames(annotation)) -->
<!-- new.label.probabilities <- l.con$propagateLabels(labels = geneX, verbose = T, fixed.initial.labels=T) -->
<!-- hist(new.label.probabilities) -->
<!-- l.con$correctGenes(genes = integrate_features_union, count.matrix = Matrix(seurat.list$ATAC@assays$ATAC@data)) -->

<!-- ``` -->

#### Transfer labels on ATAC dataset
```{r, fig.width=10, fig.height=5, eval=FALSE}
celltype.predictions <- TransferData(anchorset = transfer.anchors, 
                                     refdata = seurat.list[[reference]]$annotation, 
                                     weight.reduction = seurat.list$ATAC[["LSI"]])

coembed <- AddMetaData(coembed, metadata = celltype.predictions)
coembed@meta.data %<>%
  rownames_to_column() %>%
  dplyr::mutate(annotation=ifelse(is.na(predicted.id) , annotation, NA)) %>%
  column_to_rownames()

coembed@meta.data <-
  coembed@meta.data %>%
  rownames_to_column() %>%
  dplyr::mutate(annotation=ifelse(is.na(annotation) & prediction.score.max > 0.5, predicted.id, annotation)) %>%
  dplyr::mutate(annotation=ifelse(annotation=="SP (2)", NA, annotation)) %>%
  column_to_rownames()
```

```{r}
CombinePlots(
  list(DimPlot(coembed, group.by = c("predicted.id"), cols = cell.type.pal) + ggtitle("prediction"),
  DimPlot(coembed, group.by = c("annotation"), cols = cell.type.pal) + ggtitle("Original + prediction")),
  legend = "top"
  )
```
```{r}
FeaturePlot(coembed, features = "prediction.score.max", cells = which(coembed$tech=="ATAC")) + scale_color_viridis_c()
```


### Run Pseudotime analysis 

Identify cell of origin among the DN cells based on expression of IGLL1 and CD34

```{r, fig.height=10, fig.width=10}
FeaturePlot(coembed, features = c("IGLL1", "CD34"), split.by = "tech", slot = "data", cols = viridis::viridis(n=100))
```
```{r, eval=FALSE}
cell.oo <-
  coembed@meta.data %>% 
  rownames_to_column("cell") %>%
  mutate(IGLL1=coembed@assays$RNA@counts["IGLL1",cell]) %>%
  select(cell, annotation, IGLL1) %>%
  arrange(-IGLL1) %>%
  filter(annotation=="DN") %>%
  top_n(1, IGLL1) %>%
  pull(cell)

coembed@reductions$umap@cell.embeddings %>%
  as.tibble(rownames="cell") %>%
  mutate(cell.oo = ifelse(cell %in% cell.oo, T, F)) %>%
  ggplot(aes(UMAP_1, UMAP_2)) +
  geom_point(color="grey50") +
  geom_point(data=. %>% filter(cell.oo),color='red') +
  ggrepel::geom_text_repel(data=. %>% filter(cell.oo), aes(label="cell of origin"), color='red') +
  theme_cowplot() 

coembed <- AddMetaData(coembed, ifelse(colnames(coembed)==cell.oo, TRUE, FALSE), col.name = "iroot_cell")

  
```


```{r, eval=FALSE}
merged.sce <- SingleCellExperiment(list(counts=coembed@assays$RNA@counts, logcounts=coembed@assays$RNA@data), colData=coembed@meta.data[, c("annotation", "tech", "iroot_cell")],
                     reducedDims = map(coembed@reductions, ~ .x@cell.embeddings))

saveRDS(object = merged.sce, "~/my_data/Tcells_CCA_integration_20191203.RDS")
saveRDS(object = integrate_features_union, "~/my_data/intFeatures_Tcells_CCA_integration_20191203.RDS")
```

I infer pseudotime using the diffusion pseudotime algorithm as implemented in scanpy. Making an R/reticulate wrapper for this function would be nice, but for now, see `multiOmic_benchmark/DPT_tcells.ipynb`.

Read scanpy output and save in R object.
```{r, eval=FALSE}
dpt <- read.csv('~/my_data/Tcells_CCA_integration_20191127_scanpy_dpt.csv') %>%
  select(X, dpt_pseudotime)

coembed <- AddMetaData(coembed, column_to_rownames(dpt, 'X'))
saveRDS(coembed, "~/my_data/Tcells_CCA_integration_seurat_20191203.Rmd")
coembed <- readRDS("~/my_data/Tcells_CCA_integration_seurat_20191203.Rmd")
```


Visualize pseudotime

```{r, fig.width=10}
FeaturePlot(coembed, reduction = "umap", feature = "dpt_pseudotime", split.by = "tech", col=viridis::viridis(10)) 
```

Save figure
```{r, fig.width=10}
coembed.umaps.pl <- plot_grid(
  DimPlot(coembed, group.by = c("tech")) + theme(legend.position = "top"),
  DimPlot(coembed, group.by = c("annotation"), cols = cell.type.pal, label = TRUE, label.size = 5) + theme(legend.position = "none"),
  FeaturePlot(coembed, reduction = "umap", feature = "dpt_pseudotime") + scale_color_viridis_c(name="Diffusion\npseudotime") + ggtitle(""),
  nrow=1, ncol=3, rel_widths = c(1,1,1.2),
  labels = c("A", "B", "C")
) 

coembed.umaps.pl +
  ggsave(paste0(outdir, "coembed_umaps.png"), width=12, height = 4)
```



```{r, fig.height=8, fig.width=10}
coembed@meta.data %>%
  dplyr::mutate(`DPT rank`=dense_rank(dpt_pseudotime)) %>%
  ggplot(aes(`DPT rank`)) +
  geom_histogram(aes(fill=annotation), bins=50) +
  facet_grid(annotation~tech, scales="free_y") +
  theme_bw(base_size = 16) +
  scale_fill_manual(values = cell.type.pal)

```

Check expression of markers along pseudotime
```{r, message=FALSE, warning=FALSE, fig.width=14, fig.height=4}
coembed@assays$RNA@data[t.cell.markers$known.markers, ] %>%
  as.matrix() %>%
  reshape2::melt(varnames=c("gene", "cell")) %>%
  left_join(coembed@meta.data[,"dpt_pseudotime", drop=F] %>% rownames_to_column("cell")) %>%
  mutate(pseudotime.rank=dense_rank(dpt_pseudotime)) %>%
  group_by(gene) %>%
  arrange(pseudotime.rank) %>%
  # mutate(value=(value-min(value))/max(value)-min(value)) %>%
  mutate(value=zoo::rollmean(value, k=5, fill=NA)) %>% 
  # mutate(value=(value-mean(value))/sd(value)) %>%
  ungroup() %>%
  mutate(gene=factor(gene, levels=rev(unique(gene)))) %>%
  ggplot(aes(pseudotime.rank, gene, fill=value)) +
  geom_tile() +
  scale_fill_viridis_c(name="log expression") +
  theme_bw(base_size = 16) +
  theme(panel.border = element_blank(), panel.grid = element_blank())
```

Bin pseudotime and visualize cell type composition

```{r, fig.width=15, fig.height=4}
dpt.df <- 
  coembed@meta.data %>%
  rownames_to_column("cell") %>%
  dplyr::mutate(dpt_rank=dense_rank(dpt_pseudotime)) %>%
  mutate(dpt_bin=cut(dpt_rank, breaks = 100)) %>%
  mutate(dpt_bin=as.numeric(dpt_bin)) %>%
  select(cell,tech, annotation, prediction.score.max, dpt_bin, dpt_pseudotime, dpt_rank)

cell.type.pl <- dpt.df %>%
  ggplot(aes(dpt_bin, fill = annotation)) +
  # geom_histogram(bins=100) +
  geom_bar() +
  scale_fill_manual(values=cell.type.pal, na.value="grey50") +
  facet_grid(tech~., scales="free_y") +
  xlab("Pseudotime bin") +
  theme_bw(base_size = 16)

cell.type.pl
```

Correlation between global accessibility and pseudotime ordering.

```{r, fig.width=15, fig.height=8}
snap.out <- readRDS(file = "~/my_data/cellranger-atac110_count_30439_WSSS8038360_GRCh38-1_1_0.snapATAC.RDS")

groups <- dpt.df[dpt.df$tech=="ATAC", c("cell", "dpt_bin")]
bmat <- snap.out@bmat[str_remove(groups$cell, "ATAC_"),]
frac.accessible <- rowSums(bmat)/ncol(bmat)
acc.fraction.pl <- groups %>%
  mutate(frac_accessible=frac.accessible[str_remove(cell, "ATAC_")]) %>%
  ggplot(aes(dpt_bin, frac_accessible)) +
  geom_boxplot(aes(group=as.factor(dpt_bin)), outlier.alpha = 0.3, outlier.size = 0.7) +
  # geom_jitter(alpha=0.1) +
  xlab("Pseudotime bin") +
  ylab("Fraction of accessible bins") +
  facet_grid('ATAC'~.) +
  theme_bw(base_size = 16) 
  
dpt.pl <- plot_grid(cell.type.pl + theme(legend.position="top", axis.text.x = element_blank(), axis.ticks.x = element_blank(), axis.title.x = element_blank()), 
          acc.fraction.pl, 
          align = "v", ncol=1, nrow=2, axis="l")

dpt.pl +
  ggsave(paste0(outdir, "DPT_bins.png"), width=10, height = 7)
```

```{r, fig.height=10}
coembed.umaps.pl <- plot_grid(
  DimPlot(coembed, group.by = c("tech")) + theme_classic(base_size = 16) + theme(legend.position = "top") ,
  DimPlot(coembed, group.by = c("annotation"), cols = cell.type.pal, label = TRUE, label.size = 5) + theme_classic(base_size = 16) + theme(legend.position = "none"),
  FeaturePlot(coembed, reduction = "umap", feature = "dpt_pseudotime") +
    theme_classic(base_size = 16) +
    scale_color_viridis_c(name="Diffusion pseudotime") + ggtitle("") + 
    guides(color=guide_colorbar(barwidth = 10,title.position = "top")) +
    theme(legend.position = "top", legend.justification = "center") ,
  nrow=3, ncol=1, rel_heights = c(1.2,1,1.5)
) 

plot_grid(coembed.umaps.pl, dpt.pl, rel_widths=c(1,1.7)) +
  ggsave(paste0(outdir, "tcells_figure.png"), width=10, height = 10)
```

<!-- Viz markers -->
<!-- ```{r} -->
<!-- acc.mat <- coembed@assays$ATAC@data -->
<!-- markers.acc <- acc.mat[intersect(c(t.cell.markers$known.markers, t.cell.markers$chemokine.receptors, t.cell.markers$recombination), rownames(acc.mat)),, drop=F] -->

<!-- markers.df <- data.frame(t(as.matrix(markers.acc[,dpt.df$cell[dpt.df$tech=="ATAC"]]))) %>% -->
<!--   rownames_to_column("cell") %>% -->
<!--   pivot_longer(cols = rownames(markers.acc), names_to = "marker.gene", values_to = "accessibility") -->

<!-- annotation.hm <- atac.dpt.df %>% -->
<!--   group_by(dpt_bin, annotation) %>% -->
<!--   summarise(n=n()) %>% -->
<!--   ggplot(aes(dpt_bin, annotation)) + -->
<!--   geom_tile(aes(alpha=n, fill=annotation))  + -->
<!--   theme_classic(base_size = 16) + -->
<!--   scale_fill_manual(values=cell.type.pal, na.value="grey50") + -->
<!--   guides(fill='none', alpha='none') + -->
<!--   theme(axis.line = element_blank(), axis.ticks = element_blank(), axis.text.x = element_blank(), axis.title.x = element_blank()) -->

<!-- markers.hm <- atac.dpt.df %>% -->
<!--   full_join(markers.df) %>% -->
<!--   group_by(dpt_bin, marker.gene) %>% -->
<!--   summarise(frac_accessible=sum(accessibility)/n()) %>% -->
<!--   ungroup() %>% -->
<!--   mutate(marker.gene=factor(marker.gene, levels = c("CD34", "IGLL1", "TRGC2", "TRDC", "PTCRA", "TRBC2", "CCR9","CCR7", "RAG1", "RAG2", "TRAC", "CD4", "CD8A", "CD8B"))) %>% -->
<!--   mutate(marker.gene=factor(marker.gene, levels = rev(levels(marker.gene)))) %>% -->
<!--   group_by(marker.gene) %>% -->
<!--   mutate(frac_accessible=(frac_accessible - min(frac_accessible))/max(frac_accessible) - min(frac_accessible)) %>% -->
<!--   ggplot(aes(dpt_bin, marker.gene, fill=frac_accessible)) +  -->
<!--   geom_tile() + -->
<!--   scale_fill_viridis_c(name="Frac.cells") + -->
<!--   xlab("Pseudotime bin") + -->
<!--   theme_classic(base_size = 16) + -->
<!--   theme(axis.line = element_blank(), axis.ticks = element_blank(), axis.text.x = element_blank()) -->

<!-- leg <- get_legend(markers.hm) -->
<!-- gr1 <- plot_grid(annotation.hm, markers.hm + theme(legend.position = "none"), nrow=2, rel_heights = c(1,2), align = "v") -->
<!-- gr2 <- plot_grid(ggplot() +  theme_void(),leg, nrow=2, rel_heights = c(1,2)) -->
<!-- plot_grid(gr1, gr2, rel_widths = c(3,1)) -->
<!-- ``` -->

## Motif analysis 

I initially wanted to call peaks from SnapATAC clusters, then build a cell x peak matrix on those detected peaks, but SnapATAC/MACS2 don't seem to work. 

<!-- ---- -->
<!-- **This doesn't seem to work** -->
<!-- Call peaks  -->
<!-- ```{r} -->
<!-- ## Call peaks on clusters -->
<!-- clusters.sel <- unique(tcells.sce.atac$seurat_clusters) -->
<!-- peaks.ls = mclapply(seq(clusters.sel), function(i){ -->
<!--   print(paste("cluster", clusters.sel[i])) -->
<!--   peaks = runMACS( -->
<!--       obj=snap.out[which(snap.out@metaData$barcode %in% colnames(tcells.sce.atac)[tcells.sce.atac$seurat_clusters==clusters.sel[i]]),],  -->
<!--       output.prefix=paste0("Tcells_F74_cluster", clusters.sel[i]), -->
<!--       path.to.snaptools="/opt/conda/bin/snaptools", -->
<!--       path.to.macs="/opt/conda/bin/macs2", -->
<!--       gsize="hs", # mm, hs, etc -->
<!--       buffer.size=500,  -->
<!--       num.cores=3, -->
<!--       macs.options="--nomodel --shift 100 --ext 200 --qval 5e-2 -B --SPMR", -->
<!--       tmp.folder=tempdir() -->
<!--  ) -->
<!-- peaks -->
<!-- }, mc.cores=5) -->

<!-- peaks.names = list.files("~/my_data/Tcells_peaks/", pattern="narrowPeak", full.names = T) -->
<!-- peak.gr.ls = lapply(peaks.names, function(x){ -->
<!--   peak.df = read.table(x) -->
<!--   GRanges(str_remove_all(peak.df[,1], "b'|'"), IRanges(peak.df[,2], peak.df[,3])) -->
<!-- }) -->
<!-- peak.gr = reduce(Reduce(c, peak.gr.ls)) -->

<!-- ## Make cell by peak matrix (not run here) -->
<!-- peaks.df = as.data.frame(peak.gr)[,1:3]; -->
<!-- write.table(peaks.df,file = "~/my_data/Tcells_peaks/peaks.combined.bed",append=FALSE, -->
<!-- 		quote= FALSE,sep="\t", eol = "\n", na = "NA", dec = ".",  -->
<!-- 		row.names = FALSE, col.names = FALSE, qmethod = c("escape", "double"), -->
<!-- 		fileEncoding = "") -->
<!-- ``` -->

<!-- Making common peak reference with snaptools. In terminal -->
<!-- ``` -->
<!-- snaptools snap-add-pmat --snap-file ~/my_data/cellranger-atac110_count_30439_WSSS8038360_GRCh38-1_1_0.snap --peak-file peaks.combined.bed  -->
<!-- ``` -->

<!-- Add pmat to snap object -->
<!-- ```{r} -->
<!-- snap.out <- createPmat(snap.out, peak.gr, do.par = T, num.cores = 10) -->
<!-- ``` -->
<!-- --- -->

Alternative: load peak matrix from cellranger and add to snap object
```{r, eval=FALSE}
filt.peaks <- Read10X_h5("~/my_data/filtered_peak_bc_matrix.h5")
peaks.mat <- str_split(rownames(filt.peaks), pattern = ":|-") %>% map(rbind) %>% purrr::reduce(rbind)
peaks.gr <- GRanges(peaks.mat[,1], IRanges(as.numeric(peaks.mat[,2]), as.numeric(peaks.mat[,3])))
snap.pmat <- createSnapFromPmat(mat=t(filt.peaks[,snap.out@barcode]), barcodes=snap.out@barcode, peaks=peaks.gr)
snap.pmat
```

Calculating deviations in TF accessibility using ChromVAR. This is a measure of how much is motif accessibility in each cell is enriched compared to all the cells and general cell coverage. While SnapATAC has an wrapper around ChromVAR that outputs the deviation matrix, I just take the code from that function and run every step separately to keep the useful outputs and statistics of chromVAR.

```{r, eval=FALSE}
snap.pmat = makeBinary(snap.pmat, "pmat")

obj = snap.pmat
input.mat="pmat"
min.count=10
species="Homo sapiens"
genome=BSgenome.Hsapiens.UCSC.hg38

data.use = obj@pmat
peak.use = obj@peak

ncell = nrow(data.use)

idy = which(Matrix::colSums(data.use) >= min.count)
data.use = data.use[,idy,dropping=TRUE]
	
peak.use = peak.use[idy]

rse <- SummarizedExperiment(
		assays = list(counts = t(data.use)), 
				 rowRanges = peak.use, 
				 colData = DataFrame(Cell_Type=1:nrow(data.use), depth=Matrix::rowSums(data.use))
	);
rse <- addGCBias(rse, genome = genome);
motifs <- getJasparMotifs(collection = "CORE", species=species)
motif_mm <- matchMotifs(motifs, rse, genome = genome);
dev <- computeDeviations(object = rse, annotations = motif_mm);
var <- computeVariability(dev)
```

Save
```{r, eval=FALSE}
rowData(dev) %<>%
  as.tibble(rownames="motif") %>%
  full_join(var) %>%
  column_to_rownames('motif') %>%
  DataFrame()

saveRDS(dev, "~/my_data/Tcells_peaks/Tcells_chromVarOutput.RDS")  
```

```{r, echo=FALSE}
dev <- readRDS("~/my_data/Tcells_peaks/Tcells_chromVarOutput.RDS")  
```

```{r}
var %>%
  mutate(signif=ifelse(p_value_adj < 0.01, "signif", NA)) %>%
  mutate(rank=rank(-variability)) %>%
  ggplot(aes(rank, variability, color=signif)) +
  geom_point() +
  ggrepel::geom_text_repel(data=. %>% filter(rank < 80 & rank > 50), aes(label=name)) +
  geom_vline(xintercept = 50)
```


Visualize deviation scores of the most variable motifs, ordered in pseudotime.

```{r, fig.width=15, fig.height=10}
sample_dpt_bins.df <- dpt.df %>%
  mutate(cell=str_remove(cell, "^ATAC_")) %>%
  filter(tech=="ATAC") %>%
  arrange(dpt_pseudotime)

motif.topvar <- var %>% rownames_to_column("motif") %>% top_n(50,variability) %>% pull(motif)
tf.topvar <- motif.topvar %>% str_remove(".+_") %>% str_remove("\\(.+|:.+")
mmat.topvar <- dev@assays$data$z[motif.topvar,sample_dpt_bins.df$cell]

rownames(mmat.topvar) <- tf.topvar
smooth.mmat <- apply(mmat.topvar, 1, function(x) zoo::rollmean(x, k=30)) %>% t() 

png(paste0(outdir, "chromVAR_motif_heatmap.png"), width=1000, height = 900)
smooth.mmat %>%
  # mmat.topvar[,sample_dpt_bins.df$cell] %>%
  pheatmap::pheatmap(show_colnames = F, cluster_cols = F, clustering_distance_rows = "correlation",
                     annotation_col = sample_dpt_bins.df[,c("cell", "annotation", "dpt_pseudotime")] %>% column_to_rownames("cell"), 
                     annotation_colors = list(annotation=cell.type.pal, dpt_pseudotime=viridis::viridis(100)), fontsize = 18, fontsize_row = 12,
                     # color = colorRampPalette(rev(brewer.pal(n = 7, name ="Spectral")))(100))
                     breaks=seq(-3,3, length.out = 100)
  )
dev.off()
```

```{r, fig.width=10}
dpt.order <-
  dpt.df %>%
  filter(tech=="RNA") %>%
  arrange(dpt_pseudotime) 

coembed <- ScaleData(coembed, do.scale=TRUE)
gexmat.topvar <- coembed@assays$RNA@scale.data[tf.topvar[which(tf.topvar %in% rownames(coembed@assays$RNA@scale.data))],dpt.order$cell]
smooth.gexmat <- apply(gexmat.topvar, 1, function(x) zoo::rollmean(x, k=30)) %>% t() 
smooth.gexmat %>%
  # t() %>% scale() %>% t() %>%
  pheatmap::pheatmap(show_colnames = F, cluster_rows = T, cluster_cols = F, 
                     annotation_col = dpt.order[,c("cell", "annotation", "dpt_pseudotime")] %>% column_to_rownames("cell"),
                     annotation_colors = list(annotation=cell.type.pal, dpt_pseudotime=viridis::viridis(100)), fontsize = 18, fontsize_row = 12,
                     breaks=seq(-2,2, length.out = 100)
  )
```

Compare motif accessibility trend with gene expression trend along pseudotime. I find both examples of correlation between accessibility and TF expression (e.g. RUNX2, ELK3) and anti-correlation (e.g. JUN, ETV6).

```{r}
counts.topvar <- coembed@assays$RNA@data[tf.topvar[which(tf.topvar %in% rownames(coembed@assays$RNA@data))],dpt.order$cell]
gex.df <- 
  reshape2::melt(as.matrix(counts.topvar), varnames=c("gene", "cell")) %>% 
  # rowid_to_column("dpt_order") %>%
  mutate(data="Gene\nexpression")
mmat.df <- reshape2::melt(mmat.topvar, varnames=c("gene", "cell")) %>%
  # rowid_to_column("dpt_order") %>%
  mutate(cell=str_c("ATAC_", cell)) %>%
  mutate(data="Motif\ndeviation")

plot.tfs <- function(plot.tfs){
  bind_rows(gex.df, mmat.df) %>%
  left_join(dpt.df[, c("cell", "dpt_pseudotime", "annotation")], by="cell") %>%
  mutate(dpt_rank=dense_rank(dpt_pseudotime)) %>%
  drop_na(dpt_pseudotime) %>%
    mutate(data=factor(data, levels=c("Gene\nexpression", "smooth", "Motif\ndeviation"))) %>%
  filter(gene %in% plot.tfs) %>%
  ggplot(aes(dpt_rank, value, color=data)) +
  # geom_point(data=. %>% filter(data!="smooth"), aes(color=annotation), size=0.7, alpha=0.3) +
  geom_smooth( method="loess",span=0.2) +
  facet_grid(data~gene, scales="free") +
  xlab("Pseudotime rank") +
  theme_bw(base_size = 16) 
}

tfs <- c("JUN", "FOSL2", "FOSL1", "FOS")

pdf(paste0(outdir, "TF_plots.pdf"), width = 8, height = 5)
for (tf in tf.topvar) {
  print(plot.tfs(tf))
}
dev.off()

map(list("JUN", "ELK3", "RUNX2", "REL", "FOS", "ETV6", "TCF3"), ~ plot.tfs(.x) + ggsave(paste0(outdir, paste0('TF_plot_',.x,".png")), width = 8, height=5))
```

```{r, fig.height=12, fig.width=6}
tfs <- c("RUNX2", "ELK3","JUN", "ETV6")
plot.tfs(tfs)

tf.list <- map(tfs, ~ plot.tfs(.x))
tf.list <- map(tf.list, ~ .x + theme(legend.position = "none"))
tf.list <- map_if(tf.list, c(TRUE, TRUE, TRUE, FALSE), ~ .x + theme(axis.title.x = element_blank(), axis.ticks.x = element_blank(), axis.text.x=element_blank() ))

tf.list
plot_grid(plotlist = tf.list, align="v", axis="l", nrow=4, ncol=1, rel_heights = c(1,1,1,1.15)) +
  ggsave(paste0(outdir, "TF_pl_fig.png"), height = 11, width = 5)
```

### Ways to optimize this analysis 

- Improved motif database (more motifs, Jaspar2020 or HOCOMOCO)
- Calling peaks on clusters ()


<!-- ```{r, fig.width=14, fig.height=7} -->
<!-- bind_rows(access.df, genex.df) %>% -->
<!--   filter(gene %in% c("SPI1", "RUNX2","RUNX3", 'TCF7L2', "E2F4")) %>% -->
<!--     filter(!str_detect(cell, "^ATAC_") | tech=="ATAC") %>% -->
<!--   # group_by(tech, gene) %>% -->
<!--   # mutate(value=scale(value)) %>% -->
<!--   # ungroup() %>% -->
<!--   # drop_na() %>% -->
<!-- # filter(tech=="RNA") %>% -->
<!--   drop_na(dpt_bin) %>% -->
<!--   ggplot(aes(dpt_bin, value)) + -->
<!--   geom_point(aes(color=annotation), alpha=0.2) + -->
<!--   facet_grid(tech~gene, scales = "free_y") + -->
<!--   geom_smooth() -->


<!-- ``` -->

<!-- ```{r, fig.width=14, fig.height=7} -->
<!-- bind_rows(access.df, genex.df) %>% -->
<!--   filter(gene %in% c("ELK3", "JUNB", "FOS")) %>% -->
<!--   filter(!str_detect(cell, "^ATAC_") | tech=="ATAC") %>% -->
<!--   # group_by(tech, gene) %>% -->
<!--   # mutate(value=scale(value)) %>% -->
<!--   # ungroup() %>% -->
<!--   drop_na(dpt_bin) %>% -->
<!--   ggplot(aes(dpt_bin, value)) + -->
<!--   geom_point(aes(color=annotation), alpha=0.2) + -->
<!--   facet_grid(tech~gene, scales = "free_y") + -->
<!--   geom_smooth() + -->
<!--   scale_color_manual(values=cell.type.pal) -->


<!-- ``` -->

<!-- ## Pseudotime lag between DP(Q) in accessibility and gene expression -->
<!-- The DP (Q) cluster in the ATAC cells is scored with high confidence -->
<!-- ```{r} -->
<!-- dpq.coembed <- coembed[,which(coembed$annotation=="DP (Q)")] -->

<!-- FeaturePlot(coembed, feature="prediction.score.max") -->
<!-- DimPlot(coembed, group.by ="annotation", split.by = "tech") -->

<!-- ``` -->

<!-- ```{r, fig.width=10, fig.height=6} -->
<!-- cca.obj <- transfer.anchors@object.list[[1]] -->
<!-- new.metadata <- coembed@meta.data[,c("annotation", "tech"), drop=F] %>% rownames_to_column() %>% -->
<!--   mutate(rowname=ifelse(str_detect(rowname, "^RNA"), str_c(rowname, "_reference"), str_c(rowname, "_query"))) %>% -->
<!--   column_to_rownames() -->
<!-- cca.obj <- AddMetaData(cca.obj, new.metadata) -->
<!-- cca.obj@meta.data -->
<!-- DimPlot(cca.obj, group.by=c("annotation","tech"), reduction = "cca", dims = 1:2) -->
<!-- DimPlot(cca.obj, group.by=c("annotation","tech"), reduction = "cca", dims = 3:4) -->
<!-- DimPlot(cca.obj, group.by=c("annotation","tech"), reduction = "cca", dims = 5:6) -->
<!-- ``` -->

<!-- ```{r, fig.height=18, fig.width=18} -->
<!-- top.cc.genes <- cca.obj@reductions$cca.l2@feature.loadings %>%  -->
<!--   reshape2::melt(varnames=c("gene", "CC")) %>% -->
<!--   group_by(CC) %>% -->
<!--   mutate(rank=rank(abs(value))) %>% -->
<!--   ungroup() %>% -->
<!--   filter(rank > (max(rank)-10)) %>% -->
<!--   pull(gene) %>% -->
<!--   unique() -->

<!-- atac.mat <- coembed@assays$ATAC@data -->
<!-- rna.mat <- coembed@assays$RNA@data -->

<!-- atac.mat[gene.oi,] %>% -->
<!--   {.[,which(apply(.,2, function(x) sum(x)!=0))]} %>% -->
<!--   pheatmap::pheatmap(show_colnames=F, clustering_distance_rows = "correlation", -->
<!--                       annotation_col = coembed@meta.data[,"annotation", drop=F] -->
<!--                      ) -->
<!-- ``` -->
<!-- ```{r, fig.height=10, fig.width=10} -->
<!-- dpq.cells <- rownames(new.metadata[new.metadata$annotation=="DP (Q)",]) -->
<!-- dpq.query.ix <- which(transfer.anchors@query.cells %in% dpq.cells) -->
<!-- dpq.ref.ix <- which(transfer.anchors@reference.cells %in% dpq.cells) -->
<!-- new.metadata %>% -->
<!--   rownames_to_column() %>% -->
<!--   filter(tech=="ATAC") -->
<!-- transfer.anchors@anchors %>% -->
<!--   as.tibble() %>% -->
<!--   mutate(cell1=transfer.anchors@reference.cells[cell1]) %>% -->
<!--   mutate(cell2=transfer.anchors@query.cells[cell2]) %>% -->
<!--   mutate(anno.cell1 = new.metadata[cell1, 'annotation']) %>% -->
<!--   mutate(anno.cell2 = new.metadata[cell2, 'annotation']) %>% -->
<!--   # spread(cell2, score)  -->
<!--   ggplot(aes(score)) + -->
<!--   geom_histogram() + -->
<!--   xlim(0,1) + -->
<!--   # geom_tile() + -->
<!--   facet_grid(anno.cell1~anno.cell2, scales="free_y", space="free", labeller = "label_both")  -->
<!-- ``` -->

<!-- <!-- show anchor mat --> -->

<!-- <!-- ```{r, fig.width=10, fig.height=10} --> -->
<!-- <!-- anchor.mat <- transfer.anchors@anchors %>% --> -->
<!-- <!--   as.tibble() %>% --> -->
<!-- <!--   mutate(cell1=transfer.anchors@reference.cells[cell1]) %>% --> -->
<!-- <!--   mutate(cell2=transfer.anchors@query.cells[cell2]) %>% --> -->
<!-- <!--   spread(cell2, score) %>% --> -->
<!-- <!--   column_to_rownames('cell1') %>% --> -->
<!-- <!--   as.matrix() --> -->

<!-- <!-- anchor.mat %>%  --> -->
<!-- <!--   ifelse(is.na(.), 0, .) %>% --> -->
<!-- <!--   pheatmap::pheatmap(show_rownames = F, show_colnames = F, --> -->
<!-- <!--                      annotation_col = new.metadata[,'annotation', drop=F], --> -->
<!-- <!--                      annotation_row = new.metadata[,'annotation', drop=F], --> -->
<!-- <!--                      annotation_colors = list(annotation=cell.type.pal)) --> -->
<!-- <!-- ``` --> -->

<!-- ```{r} -->
<!-- pred.scores <- colnames(coembed@meta.data) %>% str_subset("prediction.score")  -->
<!-- coembed@meta.data %>% -->
<!--   filter(tech=="ATAC") %>% -->
<!--   select(c("annotation", pred.scores)) %>% -->
<!--   pivot_longer(cols=-annotation, names_to = "class") %>% -->
<!--   mutate(class=str_remove(class, "prediction.score.")) %>% -->
<!--   filter(class!="max") %>% -->
<!--   ggplot(aes(annotation, value, fill=class)) + -->
<!--   geom_boxplot() -->
<!-- ``` -->

<!-- ```{r, fig.width=10} -->
<!-- DefaultAssay(dpq.coembed) <- "RNA" -->
<!-- dpq.coembed <- ScaleData(dpq.coembed, features = integrate_features_union) -->
<!-- dpq.coembed <- RunPCA(dpq.coembed, features = integrate_features_union) -->

<!-- plot_grid( -->
<!--   DimPlot(dpq.coembed, group.by = c("tech"), reduction = "pca") , -->
<!--   FeaturePlot(dpq.coembed, feature="dpt_pseudotime", reduction = "pca") + scale_color_viridis_c()  -->
<!--   ) -->
<!-- ``` -->
<!-- ```{r} -->
<!-- topPC1.df <- dpq.coembed@reductions$pca@feature.loadings[,1, drop=F] %>% -->
<!--   as.tibble(rownames="gene") %>% -->
<!--   # arrange(PC_1) -->
<!--   mutate(rank= dense_rank(PC_1)) %>% -->
<!--   mutate(label=ifelse(rank > (n()-10) | rank < (10) , gene,NA))  -->

<!-- topPC1.df %>% -->
<!--   ggplot(aes(rank, PC_1)) + -->
<!--   geom_point()+ -->
<!--   ggrepel::geom_text_repel(data=. %>% filter(!is.na(label)), aes(label=label)) -->
<!-- ``` -->
<!-- ```{r, fig.height=8, fig.width=8} -->
<!-- FeaturePlot(dpq.coembed, feature=unique(topPC1.df$label)[1:6], reduction = "umap")  -->
<!--   scale_color_viridis_c() -->
<!-- ``` -->

<!-- ```{r, fig.width=10, fig.height=4} -->
<!-- cca.obj@reductions$cca@feature.loadings %>% -->
<!--   reshape2 -->
<!--   pheatmap::pheatmap() -->
<!-- DimHeatmap(cca.obj, reduction = "cca", assays = "ATAC") -->
<!-- FeaturePlot(cca.obj, reduction="cca", feature=gene.oi) -->

<!-- ``` -->


<!-- <!-- Differentially expressed genes between RNA and ATAC DP(Q) cells --> -->
<!-- <!-- ```{r} --> -->
<!-- <!-- VariableFeatures(coembed) <- integrate_features_union --> -->
<!-- <!-- dpq.diff <- FindMarkers(dpq.coembed, features=VariableFeatures(coembed),  --> -->
<!-- <!--                         group.by = "tech", ident.1 = "RNA", ident.2 = "ATAC") --> -->

<!-- <!-- top.diff <- rownames(dpq.diff[1:10,]) --> -->
<!-- <!-- FeaturePlot(coembed, features = top.diff[1:3], split.by = "tech", cols = viridis::viridis(n=100), slot = "scale.data", max.cutoff = 10) + ggtitle("Stage Markers") --> -->
<!-- <!-- ``` --> -->
<!-- <!-- ```{r} --> -->

<!-- <!-- VlnPlot(coembed[, coembed$tech=="RNA"], features = top.diff[1], group.by = "annotation", pt.size = 0.1, split.by = 'tech') --> -->
<!-- <!-- VlnPlot(coembed, features = c("AQP3", "TRBC2"), group.by = "tech") --> -->
<!-- <!-- ``` --> -->

<!-- ```{r, fig.width=12} -->
<!-- atac.mat <- coembed@assays$ATAC@data -->
<!-- rna.mat <- coembed@assays$RNA@data -->

<!-- gene.oi <- unique(topPC1.df$label) %>% str_subset("TRAV") -->
<!-- gene.oi -->
<!-- atac.df <- atac.mat[gene.oi,, drop=F] %>% -->
<!--   as.matrix() %>% -->
<!--   reshape2::melt(varnames=c("gene", "cell")) %>% -->
<!--   mutate(tech="ATAC") %>% -->
<!--   left_join(dpt.df, by=c('cell', "tech"))  -->
<!-- # %>% -->
<!-- #   group_by(tech, dpt_bin, gene) %>% -->
<!-- #   summarise(frac=sum(value!=0)/n()) -->

<!-- rna.df <- rna.mat[gene.oi,, drop=F] %>% -->
<!--   as.matrix() %>% -->
<!--   reshape2::melt(varnames=c("gene", "cell")) %>% -->
<!--   filter(str_detect(cell, "RNA_")) %>% -->
<!--   mutate(tech="RNA") %>% -->
<!--   left_join(dpt.df, by=c('cell', "tech")) -->


<!-- acc.pl <- atac.df %>% -->
<!--   drop_na(dpt_bin) %>% -->
<!--   ggplot(aes(dpt_bin, fill=as.factor(value))) + -->
<!--   geom_bar()  -->
<!--   scale_fill_manual(values=cell.type.pal, na.value="grey50") -->
<!-- acc.pl -->
<!-- ex.pl <- rna.df %>% -->
<!--   filter(gene==gene.oi) %>% -->
<!--   # mutate(value=ifelse(value>0,1,0)) %>% -->
<!--   # filter(value!=0) %>% -->
<!--   ggplot(aes(dpt_bin, value)) + -->
<!--   # geom_violin(alpha=0.2) + -->
<!--   # geom_point() -->
<!--   # scale_fill_viridis_d() -->
<!--   # scale_fill_manual(values=cell.type.pal) -->
<!--   geom_jitter(alpha=0.5, size=0.5) + -->
<!--   geom_smooth()  -->
<!--   xlim(0,50) -->


<!-- plot_grid(acc.pl, ex.pl, ncol=1, nrow=2, align = "v", axis.="l") -->
<!-- ``` -->

<!-- ```{r} -->
<!-- atac.df %>% -->
<!--   drop_na(dpt_pseudotime) %>% -->
<!--   group_by( gene, dpt_bin) %>% -->
<!--   # summarise(frac=sum(value)/n()) %>% -->
<!--   ggplot(aes(dpt_bin, value, color=gene)) + -->
<!--   # geom_point() + -->
<!--   geom_smooth() -->
<!-- ``` -->

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